package com.glory;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //this.getInitParameter() 初始化参数
        //this.getServletConfig() Servlet配置
        //this.getServletContext() Servlet上下文

        // web容器在启动的时候，它会为每个web程序都创建一个对应的ServletContext对象，它代表了当前的web应用
        ServletContext context = this.getServletContext();
        String username = "荣椿"; //数据
        //将一个数据保存在了ServletContext中，名字为：username 。值 username
        context.setAttribute("username",username);

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}
